The Caterpillars of this species are cylindrical and green,
with lateral yellow bands, and black dots on the head.
They live alone and grow to a length of about 4 cms.
They feed openly on various species of
Senna ( CAESALPINIACEAE ),
including the Australian natives :

The adult butterflies have a wingspan of about 5 cms.
The upper surfaces of the wings are white.
The males have a black tip to each forewing.
The females have black margins around each wing,
and a black dot on each forewing.